Public bug reported:
Noticed while testing: https://blueprints.launchpad.net/nova/+spec
/virt-driver-vcpu-topology
I have a host advertising 16 VCPUs (2 sockets, each 8 cores). Each core
happens to have 8 threads. (This is on a beefy POWER8 system). With the
above blueprint, I can now create a 1 socket, 2 core, 8 thread guest.
All works fine, except that I noticed "Free VCPUS: 0' even though I'm
really only using two cores. I'd think I would see 14 free VCPUs in
this scenario.
Guest lscpu output:
[root@bare-precise ~]# lscpu
Architecture: ppc64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Big Endian
CPU(s): 16
On-line CPU(s) list: 0-15
Thread(s) per core: 8
Core(s) per socket: 2
Socket(s): 1
NUMA node(s): 1
Model: IBM pSeries (emulated by qemu)
L1d cache: 64K
L1i cache: 32K
NUMA node0 CPU(s): 0-15
Resulting tracker
2014-08-12 12:17:18.874 96650 AUDIT nova.compute.resource_tracker [-] Free
VCPUS: 0
** Affects: nova
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1355921
Title:
[libvirt] When guest configured for threads, poor VCPU accounting
Status in OpenStack Compute (Nova):
New
Bug description:
Noticed while testing: https://blueprints.launchpad.net/nova/+spec
/virt-driver-vcpu-topology
I have a host advertising 16 VCPUs (2 sockets, each 8 cores). Each core
happens to have 8 threads. (This is on a beefy POWER8 system). With the
above blueprint, I can now create a 1 socket, 2 core, 8 thread guest.
All works fine, except that I noticed "Free VCPUS: 0' even though I'm
really only using two cores. I'd think I would see 14 free VCPUs in
this scenario.
Guest lscpu output:
[root@bare-precise ~]# lscpu
Architecture: ppc64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Big Endian
CPU(s): 16
On-line CPU(s) list: 0-15
Thread(s) per core: 8
Core(s) per socket: 2
Socket(s): 1
NUMA node(s): 1
Model: IBM pSeries (emulated by qemu)
L1d cache: 64K
L1i cache: 32K
NUMA node0 CPU(s): 0-15
Resulting tracker
2014-08-12 12:17:18.874 96650 AUDIT nova.compute.resource_tracker [-] Free
VCPUS: 0
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